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Definition of Greek numeral
1. Noun. One of the '''Greek numerals'''. A symbol formed from one or more of the letters of the Greek alphabet which has been modified by the addition of a mark, thus: ?' ?'. These are used to numerate monarchs, chapters, etc as Roman numerals are used in English. ¹
2. Noun. One of the words of the Greek language used to represent a number. ¹
¹ Source: wiktionary.com